Portable cook stove



FIG. 1 is a front elevation view of a portable cook stove showing my new design;

FIG. 2 is a top plan view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a right side elevation view thereof, the left side being a mirror image; and,

FIG. 5 is a rear elevation view thereof. 

The ornamental design for a portable cook stove, as shown and described. 